A more original and creative metaphor for saying something is unbelievably shit. It suggests it is shit off the floor and picked up off the floor with a shovel by a homeless or very working class person. Commonly used by the cool kids at school mostly against minecraft nerds (see minecraft nerd) to remind them how fucking awful minecraft is.

Ross: 'Sup minecraft nerds

The Minecraft Posse: go away, we are discussing the new minecraft graphics pack beta version 1.4.6.7.4